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  • word of the day

    armillary sphere

    armillary sphere - 365bet中国官方网站 definition and meaning for word armillary sphere

    Definition
    (noun) a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars
    Synonyms : armilla

  • Word used in video below:
    text: sphere and a sample of quartz flecked
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